One of the better-known customs at Jewish wedding ceremonies is for the groom to break a glass (Rema, Orah Hayyim, par. 560). There are several reasons for this practice, the most widely known being remembrance of the destruction of Jerusalem and the Temple, in fulfillment of the oath, “if I do not keep Jerusalem in memory even at my happiest hour” (Ps. 137:6). Another well-known reason for breaking a glass is to remind us that there cannot be complete joy at this time (Sha’arei Teshuvah on Orah Hayyim, par. 560). Along similar lines, the origin of the custom of breaking a glass is attributed to the practice of Mar the son of Rabbina and Rav Ashi, who deliberately broke valuable glass goblets at the weddings of their children in order to tone down the rejoicing and light-heartedness among the guests present at the event (Berakhot 31a). According to this interpretation, breaking a glass is intended to remind those present that even at a time of supreme rejoicing one must retain a reasonable measure of seriousness........

Isaiah promises that, after the people of Israel are punished and exiled, they will experience remarkable reconciliation with God. “Speak tenderly to Jerusalem,” God instructs, and tell the city that her term of service is over (40:2). She has finished paying the price for her crimes, and has atoned for her sins. Now is time to prepare for an amazing revelation of God's presence.